Hi Aiswarya,
I too faced the issue and then i was able to resolve it. The issues is not in Razorpay or your PAN number. The problem is the Name. Maybe the name you give and the name from validation system is not matching. Solution is to check it from income tax efilling website.
Login to income tax website: https://www.incometax.gov.in/iec/foportal/
Go to "My Profile"
In your personal details section, you will fine the Name and the PAN number.
Copy the Name and paste it in the Airbnb name field for validation.
This should solve the problem